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Low temperature district heating network

Design and construction of the world’s largest low temperature district heating system is currently underway at Brunnshög in Lund. The background to this major investment is our desire to make the most efficient use of the low temperature residual heat available in Brunnshög. The technique is well-adapted and very suitable to the modern, energy-efficient homes and businesses to be constructed at Brunnshög.

Low temperature residual heat (30-50°C) is available in large quantities in Lund, from various kinds of activities and facilities. We already have access to residual heat from the MAX IV research facility at Brunnshög. Residual heat from this source is currently transferred to Lund’s existing district heating network, having been heated to 90°C using heating pumps. Soon, this heat will also be used directly (almost entirely without the addition of extra energy) in the new low temperature network.

The installation of the network, and the access to low temperature residual heat from sources such as MAX IV, means that we will be able to immediately supply new buildings in Brunnshög with heating. The first deliveries are expected in September 2019.

In addition to heating homes and business premises, residual heat and the low temperature network could be utilised in areas that we do not currently use heating. For example, the technology can be used to heat the ground at bus stops, town squares and along pedestrian and cycle paths during the winter, eliminating the need for snow removal and avoiding slippery surfaces. We are also investigating other applications for the technology in the EU financed COOL DH innovation project.

Quick facts

  • 4.4 km in length
  • 65°C supply line, 35°C return line
  • Construction commenced autumn 2017
  • First delivery 2019

Facts

Developer: Kraftringen